21332329 has 2 divisors, whose sum is σ = 21332330. Its totient is φ = 21332328.

The previous prime is 21332261. The next prime is 21332347. The reversal of 21332329 is 92323312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20684304 + 648025 = 4548^2 + 805^2 .

It is a cyclic number.

It is not a de Polignac number, because 21332329 - 2¹⁵ = 21299561 is a prime.

It is not a weakly prime, because it can be changed into another prime (21332359) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10666164 + 10666165.

It is an arithmetic number, because the mean of its divisors is an integer number (10666165).

Almost surely, 2^21332329 is an apocalyptic number.

It is an amenable number.

21332329 is a deficient number, since it is larger than the sum of its proper divisors (1).

21332329 is an equidigital number, since it uses as much as digits as its factorization.

21332329 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1944, while the sum is 25.

The square root of 21332329 is about 4618.6934299648. The cubic root of 21332329 is about 277.3401573855.

It can be divided in two parts, 2 and 1332329, that added together give a palindrome (1332331).

The spelling of 21332329 in words is "twenty-one million, three hundred thirty-two thousand, three hundred twenty-nine".